netns xfrm: fix "ip xfrm state|policy count" misreport

[safe/jmp/linux-2.6] / mm / mincore.c

diff --git a/mm/mincore.c b/mm/mincore.c
index 8cb508f..7a3436e 100644 (file)
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -14,6 +14,7 @@
 #include <linux/syscalls.h>
 #include <linux/swap.h>
 #include <linux/swapops.h>
+#include <linux/hugetlb.h>
 
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
@@ -72,6 +73,42 @@ static long do_mincore(unsigned long addr, unsigned char *vec, unsigned long pag
        if (!vma || addr < vma->vm_start)
                return -ENOMEM;
 
+#ifdef CONFIG_HUGETLB_PAGE
+       if (is_vm_hugetlb_page(vma)) {
+               struct hstate *h;
+               unsigned long nr_huge;
+               unsigned char present;
+
+               i = 0;
+               nr = min(pages, (vma->vm_end - addr) >> PAGE_SHIFT);
+               h = hstate_vma(vma);
+               nr_huge = ((addr + pages * PAGE_SIZE - 1) >> huge_page_shift(h))
+                         - (addr >> huge_page_shift(h)) + 1;
+               nr_huge = min(nr_huge,
+                             (vma->vm_end - addr) >> huge_page_shift(h));
+               while (1) {
+                       /* hugepage always in RAM for now,
+                        * but generally it needs to be check */
+                       ptep = huge_pte_offset(current->mm,
+                                              addr & huge_page_mask(h));
+                       present = !!(ptep &&
+                                    !huge_pte_none(huge_ptep_get(ptep)));
+                       while (1) {
+                               vec[i++] = present;
+                               addr += PAGE_SIZE;
+                               /* reach buffer limit */
+                               if (i == nr)
+                                       return nr;
+                               /* check hugepage border */
+                               if (!((addr & ~huge_page_mask(h))
+                                     >> PAGE_SHIFT))
+                                       break;
+                       }
+               }
+               return nr;
+       }
+#endif
+
        /*
         * Calculate how many pages there are left in the last level of the
         * PTE array for our address.